Ochoa Ob-3 Process Water Storage Lagoon

About Ochoa Ob-3 Process Water Storage Lagoon

Ochoa Ob-3 Process Water Storage Lagoon is a dam in Adams, Washington. The dam is owned by Ob-3 Resource Management Llc (private). It impounds the Offstream Drains Tolind Coulee near Warden.

The dam stands 32 feet tall and stretches 2,000 feet across, creates a reservoir covering 16 acres, and has a maximum storage capacity of 361 acre-feet. Completed in 2009, the structure is relatively new.

This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 08/10/2020.

At 32 feet, this dam is taller than 76% of dams nationwide.

Living Downstream

If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Washington dam safety program can provide more specific information about emergency planning for this structure.

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